Charlotte beer delivery startup Brewpublik is once again running a promotion this weekend in which they’ll replace your old, cheap booze with fresh craft beer for no charge.

The #SpringCleanMyBeer special runs April 15-16 in Charlotte, Raleigh, San Francisco and Charleston, where Brewpublik launched Monday.

Participating customers fill out a form online here that asks about the beer they have, the kind they’d like to swap and their location. They’re then asked to take a photo of their unwanted six-pack of beer, tweet it to @Brewpublik and include the hashtag #SpringCleanMyBeer. Brewpublik will then deliver a new six-pack of free craft beer to the customer.

Sign up ends at 9 p.m. April 14, Brewpublik said on its Instagram.

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Last year, the startup said the promotion helped increase brand awareness and pick up new subscribers. It delivered 83 packs of Charlotte craft brews, including beer from NoDa, Triple C, Unknown and OMB. And after last year’s promotion, the company hosted a Low Country all-you-can-eat shrimp boil at NoDa Brewing.

It’s unclear what plans for leftover beer will be this year.

“We’re gonna have even more fun this year with the beer and *hint* it’s gonna be explosive and will involve the destruction of lots of beer,” co-founder and CEO Charlie Mulligan said in an email.

Brewpublik launched in early 2015 and delivers craft beer in six-, 12- or 24-packs directly to customers once a month. The beer is delivered in a wooden crate and costs $20, $30 or $55, depending on the subscription.